I got a brand new guitar and the fourth string sounds like crap. I changed the string but it still sounds the same. What could be wrong?

This is a brand new guitar. Now I admit I got it off amazing for thirty some dollars because I don’t have a lot of extra money. I changed the string (hence why it’s gold instead of bronze in video) and nothing changed. All the other strings sound just fine so this confuses me. How can I fix this issue???
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